But I probably will not install binaries like `if, exec, wait` to
default PATH(like /usr/bin). Although I understand this is possible
technically(and currently no other programs claim these names).

The actual reason is that I can't afford time to argue with other
developers. When I ask on debian-devel list, at least someone is
object to this[1].

I will then suggest that you refrain from packaging execline for
Debian until your fellow developers stop forcing you to "fix" things
that are only a problem in their imaginations - causing very real
breakage with the "fixes".
Users deserve packages done the right way. They do not deserve
software that is broken by distribution bigotry.
--
Laurent